Uichabd walker



tait@ tets tttmt @frn RICHARD WALKER, OF IBATAVIA, NEW YORK.

Letters Patent No. 67,386, cla-ted July 30, 1867.V

IIVIIDBOVEMENT IN LII'TING-JAGK.

TO-ALL WHOM IT MAY CONCERN:

Bie it known that I, R. 1WALKER, of Batavia, in the State'of New York, have invented certain new and useful Improvements in Lifting-Jacks; and I hereby declare that the following is a true, full, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon. In the drawing annexed, which makes a part of this specification, the figure marked 1 represents o. perspective view of my lifting jack when in position.

The letter A designates the stock of my jack and B the base. The stock Alias a vert-ical slot extending from its top downwards to about two-thirds of its length. Into this slot the lever C is inserted, and piays on a pivot, t, which passes through A. D represents a step-block, which is placed in the slot immediately above lever C, and confined there by the pin a and shoulder d. The step-block D has a vertical pla-y when operated by lever C, F designates a thin metal plate, serrated at its lower edge, and pla-eed inside the slot, and restingV against the side of lever C. The upper end of plate F is pivoted to the lower end of step-block D, and oeeupieswag oblique position, and performs the oihce et' holding the step-bloek D at any desired elevation by means of its teeth catching on pivot t.

The operation of my jack is simple. In applying it to raise a wagon-axle or any other weight, the operator will disengage the teeth of plate F from pivot t, and at the same time press down the lever C until the axle is elevated to the proper height, when the serrated plate F will be permitted to fall ou pivot t, and the step-bloek D will be held firmly in its position under the superincumbent pressure. It will be seen that the top of stock A is divided into two parts by the slot in which the lever und step-bleek play, and to prevent a further separation of these parts they are hound together by an iron clamp.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

The lever C, step-block D7 and serrated plate F, when acting in conjunction as and for the purpose herein set forth.

In testimony that I claim the above I aix my signature in presence of two witnesses.

RICHARD WALKER.

Witnesses:

M. WELLS HRWITT, J. T. BURTON. 

